On 2395Mhz there is a strong, wide downlink only DVB-S PSK carrier
from the HAMTV downlink from the ISS. I am not sure you can pick it up
with your set up. On a spectrum analyser you see a wide hump around
two megahertz wide. It is very strong when directly overhead. It is
true circularly polarised, but you MUST use antennas with RHCP not
LHCP, or you will block the signal.
At the moment it is broadcasting on every pass, with blank video, but
the DVB-S carrier is sending normal data.
It is expected to turn off on Monday 31 August 2015, between 15:00
and 15:10 UTC. until mid September as it's power supply is being
borrowed for another experiment. This should not affect other HAM
equipment on board the ISS such a packet.
http://www.ariss-eu.org/columbus.htm